- Players and monsters do, in fact, block each other. The helmet only
prevents death.
- Death happens during collision check, which is the entire reason items
don't save you: you're collided with first! This allows removing
several special cases.
- Spring mining is prevented almost incidentally, by virtue of collision
being checked both at decision time and movement time. It /can/
happen to actors other than the player, but seemingly not blocks.
- Some monsters, whose movement is essentially forced anyway, skip the
decision time collision check. This includes doppelgangers, which is
why they always spring mine.
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